In the Meta site, the font-specification is
font-family: 'LusitanaRegular',"Palatino Linotype",Palatino,"Hoefler Text","Book Antiqua",Georgia,serif;
which contains an error in the first name so it's ignored and one of the Palatinos is substituted.
Fonts are all over the place; some items are Georgia by default; some are Lusitania [it's spelled correctly in the Main site]; some are Arial/Helvetica. And the main title's capital C comes from a different family from the rest of the name, which really, really grates.